
%0 Journal Article
%A Norris, RH 
%A Moore, JL 
%A Maher, WA 
%A Wensing, LP 
%T Limnological characteristics of two coastal Dune Lakes, Jervis Bay, South Eastern Australia
%J Marine and Freshwater Research
%D 1993/06/01
%V 44
%N 3
%P 437-458
%K 
%R https://doi.org/10.1071/MF9930437
%U https://www.publish.csiro.au/paper/MF9930437 
%X Limnological features of two permanent, closed, coastal dune lakes that are  separated by only about 400 m are reported. The depth of Lake Windermere  fluctuated by about 7 m during this study (1982- 1988); however, fluctuations  up to 15 m were observed between 1970 and 1988. Lake Windermere is  exposed to wind mixing, is transparent and is usually mixed, or only weakly  stratified. Lake McKenzie is semi-perched, darkly coloured and strongly  stratified with an anoxic hypolimnion during summer. It is about one fifth  of the surface area and half the depth of Lake Windermere and protected  from wind mixing. Both lakes are acidic and have low salinity, and the  dominant ions are sodium and chloride probably from precipitation of  marine aerosols. Oxygen depletion in the hypolimnion of both lakes indicates  a substantial organic load, the source of which is allochthonous material from  the catchment rather than autochthonous material. Lake Windermere had higher  densities of zooplankton (mostly Calamoecia tasmanica) than Lake McKenzie,  but the latter lake had higher numbers of the predaceous Chaoborus sp. Lake  McKenzie had higher invertebrate densities than Lake Windermere and these  fluctuated widely between years, corresponding with variation in rainfall. Mayflies  and chironomids were numerically dominant in Lake McKenzie, and caddisflies  and chironomids were numerically dominant in Lake Windermere. Turtle and  odonate predators were more common in Lake McKenzie than in Lake Windermere.  It is postulated that biological interactions are more important in shaping the communities  in Lake McKenzie and physical factors such as wave action are more important in Lake Windermere. 
